A lot of manufacturers are loading a lot of unnecessary applications into the startup configurations. This unnecessarily loads the RAM with applications you are not using, with the result that boot times are increased and the machine is slowed down. This leads some people with 1 GB Vista machines to conclude that they either have a defective machine or have insufficient RAM.
If you feel the perfomance is unsatisfactory, click on the system configuration item in the start menu, click selective startup on the General tab, then deselect non-system and non-security items on the Startup tab. Then click OK, reboot, and enjoy. With the Toshiba package, this decreased the RAM load by about 400 MB, the difference between misery and joy on a 1 GB machine. Current RAM load as I write this is about 750 MB. Your machine will have about the same capabilities as an XP machine with 512 MB RAM.
The deselected applications will still be available when you need them. If there's something that you really miss, you can always add it back.